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KVM: MMU: Make setting shadow ptes atomic on i386

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Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-05-31 15:46:04 +03:00
parent 0d551bb698
commit e663ee64ae
3 changed files with 15 additions and 4 deletions
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1
drivers/kvm/Kconfig
View File

@ -11,6 +11,7 @@ if VIRTUALIZATION
config KVM
tristate "Kernel-based Virtual Machine (KVM) support"
depends on X86 && EXPERIMENTAL
depends on X86_CMPXCHG64 || 64BIT
---help---
Support hosting fully virtualized guest machines using hardware
virtualization extensions. You will need a fairly recent

14
drivers/kvm/mmu.c
View File

@ -22,6 +22,7 @@
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/module.h>
#include <asm/cmpxchg.h>
#include "vmx.h"
#include "kvm.h"
@ -204,6 +205,15 @@ static int is_rmap_pte(u64 pte)
== (PT_WRITABLE_MASK | PT_PRESENT_MASK);
}
static void set_shadow_pte(u64 *sptep, u64 spte)
{
#ifdef CONFIG_X86_64
set_64bit((unsigned long *)sptep, spte);
#else
set_64bit((unsigned long long *)sptep, spte);
#endif
}
static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
struct kmem_cache *base_cache, int min,
gfp_t gfp_flags)
@ -446,7 +456,7 @@ static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn)
rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
rmap_remove(vcpu, spte);
kvm_arch_ops->tlb_flush(vcpu);
*spte &= ~(u64)PT_WRITABLE_MASK;
set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK);
}
}
@ -699,7 +709,7 @@ static void kvm_mmu_zap_page(struct kvm_vcpu *vcpu,
}
BUG_ON(!parent_pte);
kvm_mmu_put_page(vcpu, page, parent_pte);
*parent_pte = 0;
set_shadow_pte(parent_pte, 0);
}
kvm_mmu_page_unlink_children(vcpu, page);
if (!page->root_count) {

4
drivers/kvm/paging_tmpl.h
View File

@ -234,7 +234,7 @@ static void FNAME(set_pte_common)(struct kvm_vcpu *vcpu,
spte |= gaddr;
spte |= PT_SHADOW_IO_MARK;
spte &= ~PT_PRESENT_MASK;
*shadow_pte = spte;
set_shadow_pte(shadow_pte, spte);
return;
}
@ -280,7 +280,7 @@ unshadowed:
if (access_bits & PT_WRITABLE_MASK)
mark_page_dirty(vcpu->kvm, gaddr >> PAGE_SHIFT);
*shadow_pte = spte;
set_shadow_pte(shadow_pte, spte);
page_header_update_slot(vcpu->kvm, shadow_pte, gaddr);
if (!was_rmapped)
rmap_add(vcpu, shadow_pte);